Title:
INTERMETALLIC COMPOUND SUPERCONDUCTOR AND ALLOY SUPERCONDUCTOR, AND METHOD FOR THEIR PREPARATION
Document Type and Number:
WIPO Patent Application WO/2002/055435
Kind Code:
A1
Abstract:
A novel intermetallic compound superconductor characterized in that it is an intermetallic compound consisting of magnesium (Mg) and boron (B), is represented by the chemical empirical formula Mg¿1?B¿2?, has a hexagonal AlB¿2? type crystalline structure, and has a superconductivity transition temperature (T¿c?) of 39K; an alloy superconductor which contains the intermetallic compound, is excellent in malleability and ductility and has a superconductivity transition temperature (T¿c?) of 39K; and a method for preparing the alloy superconductor which comprises mixing a raw material powder containing Mg and a raw material powder containing B, and subjecting the resultant mixture to, for example, pressure molding with heating. The alloy superconductor exhibits a high superconductivity transition temperature and also excellent malleability and ductility. The preparation method allows the preparation of the alloy with good reproducibility and at a low production cost.
Inventors:
AKIMITSU JUN (JP)
ZENITANI YUJI (JP)
MURANAKA TAKAHIRO (JP)
NAKAGAWA NORIMASA (JP)
NAGAMATSU JUN (JP)
ZENITANI YUJI (JP)
MURANAKA TAKAHIRO (JP)
NAKAGAWA NORIMASA (JP)
NAGAMATSU JUN (JP)
Application Number:
PCT/JP2001/006383
Publication Date:
July 18, 2002
Filing Date:
July 24, 2001
Export Citation:
Assignee:
JAPAN SCIENCE & TECH CORP (JP)
AKIMITSU JUN (JP)
ZENITANI YUJI (JP)
MURANAKA TAKAHIRO (JP)
NAKAGAWA NORIMASA (JP)
NAGAMATSU JUN (JP)
AKIMITSU JUN (JP)
ZENITANI YUJI (JP)
MURANAKA TAKAHIRO (JP)
NAKAGAWA NORIMASA (JP)
NAGAMATSU JUN (JP)
International Classes:
C01B35/00; C04B35/58; C01B35/04; C04B35/645; C04B35/653; C22C1/00; C22C1/04; C22C23/00; C22C33/02; H01B12/00; H01B13/00; H01L39/12; H01L39/24; (IPC1-7): C01B35/04
Other References:
JUN NAGAMATSU ET AL.: "Superconductivity at 39K in magnesium diboride", NATURE, vol. 410, 1 March 2001 (2001-03-01), pages 63 - 64, XP002948368
D.C. LARHALESTLER ET AL.: "Strongly linked current flow in polycrystalline forms of the superconductor MgB2", NATURE, vol. 410, 8 March 2001 (2001-03-08), pages 186 - 189, XP002948369
A.V. TSVYASHCHENKO ET AL.: "Electric field gradients in MgB2 synthesized at high pressure: 111Cd TPDAC study and ab initio calculation", SOLID STATE COMMUNICATIONS, vol. 119, no. 3, 17 July 2001 (2001-07-17), pages 153 - 158, XP002948370
See also references of EP 1350762A4
D.C. LARHALESTLER ET AL.: "Strongly linked current flow in polycrystalline forms of the superconductor MgB2", NATURE, vol. 410, 8 March 2001 (2001-03-08), pages 186 - 189, XP002948369
A.V. TSVYASHCHENKO ET AL.: "Electric field gradients in MgB2 synthesized at high pressure: 111Cd TPDAC study and ab initio calculation", SOLID STATE COMMUNICATIONS, vol. 119, no. 3, 17 July 2001 (2001-07-17), pages 153 - 158, XP002948370
See also references of EP 1350762A4
Attorney, Agent or Firm:
Hirayama, Kazuyuki (Shinjukugyoen Bldg. 3-10 Shinjuku 2-chome Shinjuku-ku, Tokyo, JP)
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